WO2021169889A1 - Matériau d'aimant neodyme-fer-bore, composition de matière première, son procédé de préparation et son utilisation - Google Patents

Matériau d'aimant neodyme-fer-bore, composition de matière première, son procédé de préparation et son utilisation Download PDF

Info

Publication number
WO2021169889A1
WO2021169889A1 PCT/CN2021/077174 CN2021077174W WO2021169889A1 WO 2021169889 A1 WO2021169889 A1 WO 2021169889A1 CN 2021077174 W CN2021077174 W CN 2021077174W WO 2021169889 A1 WO2021169889 A1 WO 2021169889A1
Authority
WO
WIPO (PCT)
Prior art keywords
content
mass percentage
raw material
neodymium iron
iron boron
Prior art date
Application number
PCT/CN2021/077174
Other languages
English (en)
Chinese (zh)
Inventor
骆溁
黄佳莹
廖宗博
蓝琴
林玉麟
师大伟
谢菊华
龙严清
Original Assignee
厦门钨业股份有限公司
福建省长汀金龙稀土有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 厦门钨业股份有限公司, 福建省长汀金龙稀土有限公司 filed Critical 厦门钨业股份有限公司
Publication of WO2021169889A1 publication Critical patent/WO2021169889A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
    • H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
    • H01F1/047—Alloys characterised by their composition
    • H01F1/053—Alloys characterised by their composition containing rare earth metals
    • H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
    • H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
    • H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
    • H01F41/0266—Moulding; Pressing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
    • H01F41/0293—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets diffusion of rare earth elements, e.g. Tb, Dy or Ho, into permanent magnets

Definitions

  • the invention relates to a neodymium iron boron magnet material, raw material composition, preparation method and application.
  • Nd-Fe-B permanent magnet material is based on Nd 2 Fe l4 B compound, which has the advantages of high magnetic properties, small thermal expansion coefficient, easy processing and low price. Since its introduction, it has grown at an average annual rate of 20-30%. Become the most widely used permanent magnet material. According to the preparation method, Nd-Fe-B permanent magnets can be divided into three types: sintering, bonding and hot pressing. Among them, sintered magnets account for more than 80% of the total output and are the most widely used.
  • Co is widely used in high-tech fields such as neodymium iron boron rare earth permanent magnets, samarium cobalt rare earth permanent magnets, batteries, etc.
  • Co is an important strategic resource and the price is relatively expensive.
  • the invention aims to overcome the technical problem of the prior art neodymium iron boron magnets by adding Co to increase the Curie temperature and coercivity, while Co faces the expensive defect, and provides a neodymium iron boron magnet material and raw material Composition, preparation method, application.
  • the magnet material of the present invention has the advantages of high remanence and high coercivity.
  • the neodymium iron boron magnet material provided by the present invention adopts the scheme of low content of Co and no heavy rare earth metal added to the smelting metal, while reasonably controlling the total rare earth content and the content range of Cu, B and M (Ti, Nb, Zr, etc.) elements, so that The impurity phases are more distributed in the two grain boundaries, the continuity of the grain boundaries is improved, and the area of the triangular area of the grain boundaries is reduced, so that the magnet remanence B and coercive force Hcj.
  • R 28 to 33 wt%;
  • the R is a rare earth element and includes rare earth metal R1 for smelting and rare earth metal R2 for grain boundary diffusion, and the content of R2 is 0.2 to 1 wt%;
  • the R1 includes Nd and does not contain RH;
  • the R2 includes Tb;
  • M 0.4wt% or less and not 0wt%
  • M includes one or more of Ti, Ni, V, Nb, Ta, Cr, Mo, W, Mn, Zr, Hf, Zn and Ag;
  • the RH is a heavy rare earth element
  • the wt% is the mass percentage of each element in the raw material composition.
  • the content of R preferably ranges from 29.5 to 31.5 wt% or 29.8 to 32.8 wt%, such as 31.2 wt%, 32.2 wt%, or 30.9 wt%.
  • the mass percentage preferably ranges from 29.5 to 31.5 wt% or 29.8 to 32.8 wt%, such as 31.2 wt%, 32.2 wt%, or 30.9 wt%.
  • the R1 may also include one or more of Pr, La and Ce; preferably, it includes Pr.
  • the addition form of Pr can be conventional in the art, for example, in the form of PrNd, or in the form of a mixture of pure Pr and Nd, or in the form of a mixture of PrNd, pure Pr and Nd Add to.
  • the content of Pr is preferably 0.1-2 wt%.
  • the content of R2 is preferably in the range of 0.2 to 0.8 wt% or 0.5 to 1 wt%, such as 0.6 wt%, 0.9 wt% or 0.94 wt%, and wt% is the mass of the element in the raw material composition. percentage.
  • the content of Tb preferably ranges from 0.5 to 1% by weight, such as 0.8% by weight, 0.6% by weight, 0.75% by weight, 0.9% by weight or 0.7% by weight.
  • the percentage of mass preferably ranges from 0.5 to 1% by weight, such as 0.8% by weight, 0.6% by weight, 0.75% by weight, 0.9% by weight or 0.7% by weight. The percentage of mass.
  • the R2 may also include one or more of Pr, Dy, Ho and Gd. These rare earth elements can form a shell layer for diffusing rare earth elements through the principle of grain boundary diffusion.
  • the content of the Pr is preferably 0.2wt% or less and not 0wt%, such as 0.2wt% or 0.1wt%, and wt% means that the element accounts for the raw material composition. The percentage of mass.
  • the content of Dy is preferably less than 0.3% by weight and not 0% by weight, such as 0.1% by weight, 0.05% by weight, or 0.12% by weight.
  • the mass percentage of the raw material composition is preferably less than 0.3% by weight and not 0% by weight, such as 0.1% by weight, 0.05% by weight, or 0.12% by weight.
  • the content range of the Ho is preferably 0.15 wt% or less and not 0 wt%, such as 0.1 wt% or 0.02 wt%, and wt% means that the element accounts for the raw material composition. The percentage of mass.
  • the content of the Gd is preferably 0.15 wt% or less and not 0 wt%, such as 0.1 wt% or 0.06 wt%, and wt% means that the element accounts for the raw material composition The percentage of mass.
  • the content of B is preferably in the range of 0.9 to 0.99 wt% or 0.98 to 1.05 wt%, such as 1 wt%, 1.02 wt% or 1.03 wt%, and wt% is the mass of the element in the raw material composition percentage.
  • the content of Cu is preferably 0.07-0.15wt% or less than 0.08wt%, and not 0wt%, such as 0.12wt%, 0.13wt%, 0.03wt%, 0.05wt%, 0.09wt %, 0.1 wt% or 0.07 wt%, and wt% is the mass percentage of the element in the raw material composition.
  • the Cu may be added during smelting and/or grain boundary diffusion.
  • the Cu When the Cu is added when it diffuses at the grain boundary, the Cu is added in the form of a PrCu alloy, and the content of Cu is preferably 0.03 to 0.15 wt%, and wt% is the mass percentage of the element in the raw material composition; Wherein, the percentage of Cu in the PrCu is 0.1-17 wt%.
  • the content of M is preferably 0.1-0.15wt% or 0.1-0.32wt%, such as 0.25wt%, 0.32wt%, 0.22wt%, 0.32wt% or 0.2wt%, and wt% is the element It accounts for the mass percentage of the raw material composition.
  • the M may also include one or more of Bi, Sn, Zn, Ga, In, Au and Pb.
  • the M includes one or more of Ga, Ti and Nb.
  • the content of Ga may range from 0.02 to 0.3 wt%, preferably 0.02 to 0.1 wt% or 0.08 to 0.2 wt%, for example, 0.07 wt%, where wt% is the element accounted for The mass percentage of the raw material composition.
  • the content of Ti may range from 0 to 0.35 wt%, preferably 0.05 to 0.3 wt% or 0.1 to 0.15 wt%, such as 0.12 wt%, 0.05 wt% or 0.2 wt%, wt% is the mass percentage of the element in the raw material composition.
  • the content of Nb is preferably in the range of 0.05 to 0.1 wt%, and wt% is the mass percentage of the element in the raw material composition.
  • the raw material composition also contains Al; the content of Al is preferably 0.03wt% or less, and not 0wt%, for example 0.01wt%, and the weight% is the amount of the element.
  • the mass percentage of the raw material composition preferably 0.03wt% or less, and not 0wt%, for example 0.01wt%, and the weight% is the amount of the element.
  • Al+Ga+Cu may be 0.15wt% or less and not 0wt%, such as 0.12wt%; preferably, Al+Ga+Cu is 0.11 wt% is less than 0 wt%, such as 0.07 wt%, and wt% is the mass percentage of the element in the raw material composition.
  • the M element includes Ga
  • Ga is 0.2wt% or more and not 0.35wt%
  • Ti+Nb in the composition of the M element is 0.07wt% or less and not 0wt%, for example, 0.05wt%
  • Wt% is the mass percentage of the element in the raw material composition. Among them, if Ti+Nb is excessive, the remanence may be reduced.
  • the Co content range is preferably 0.4 wt% or less, and is not 0, such as 0.1 wt%, 0.2 wt%, 0.3 wt% or 0.15 wt%, and wt% is the element accounted for The mass percentage of the raw material composition.
  • the raw material composition contains the following components: in R1: Nd 27.5wt%; in R2: Tb 0.5wt%; B0.9wt%, Cu 0.15wt%, Ti 0.35 wt%, Co 0.1 wt%, the balance is Fe and inevitable impurities, and wt% is the mass percentage of the element in the raw material composition.
  • the raw material composition contains the following components: in R1: Nd 32wt%; in R2: Tb 0.8wt%; B 1wt%, Cu 0.12wt%, Ti 0.15 wt%, Nb 0.1 wt%, Co 0.2 wt%, the balance is Fe and unavoidable impurities, and wt% is the mass percentage of the element in the raw material composition.
  • the raw material composition in terms of weight percentage, includes the following components: in R1: Nd 30.4wt%, Pr 0.2wt%; in R2: Dy 0.1wt%, Tb 0.5wt%; B 0.98wt%, Cu 0.07wt%, Ti 0.12wt%, Nb 0.1wt%, Ga 0.1wt%, Co 0.3wt%, the balance is Fe and unavoidable impurities, and wt% is the element in the raw material composition The percentage of mass.
  • the raw material composition contains the following components: in R1: Nd 30.8wt%, Pr 0.5wt%; in R2: Dy 0.1wt%, Tb 0.6wt%, Pr 0.2wt%; B1.02wt%, Cu 0.13wt%, Ti 0.15wt%, Ga 0.07wt%, Co 0.15wt%, the balance is Fe and unavoidable impurities, and the weight% is the element in the raw material composition The percentage of mass.
  • the raw material composition contains the following components: in R1: Nd 29.9wt%; in R2: Dy 0.05wt%, Tb 0.75wt%, Ho 0.1wt%, Gd 0.1wt%; B 1.1wt%, Cu 0.03wt%, Ti 0.05wt%, Ga 0.1wt%, Co 0.15wt%, the balance is Fe and unavoidable impurities, and the weight% is the element in the raw material composition The percentage of mass.
  • the raw material composition contains the following components: in R1: Nd 28.5wt%; in R2: Dy 0.12wt%, Tb 0.7wt%, Pr 0.1wt%, Ho 0.02wt%, Gd 0.06wt%; B 1.03wt%, Cu 0.05wt%, Ti 0.3wt%, Ga 0.02wt%, Co 0.2wt%, the balance is Fe and unavoidable impurities, and wt% is the element accounted for The mass percentage of the raw material composition.
  • the raw material composition contains the following components: in R1: Nd 29wt%; in R2: Tb 0.8wt%; B 0.99wt%, Cu 0.09wt%, Ti 0.2wt%, Al 0.03wt%, Co 0.4wt%, the balance is Fe and unavoidable impurities, and the weight% is the mass percentage of the element in the raw material composition.
  • the raw material composition contains the following components: in R1: Nd 30.5wt%; in R2: Dy 0.1wt%, Tb 0.9wt%; B 1wt%, Cu 0.1wt%, Nb 0.05wt%, Ga 0.3wt%, Al 0.01wt%, Co 0.1wt%, the balance is Fe and unavoidable impurities, and wt% is the mass percentage of the element in the raw material composition.
  • the present invention also provides a neodymium iron boron magnet material, R: 28-33wt%; said R includes R1 and R2, the content of said R2 is 0.2-1wt%; said R1 includes Nd and does not contain RH;
  • M 0.4wt% or less and not 0wt%
  • M includes one or more of Ti, Ni, V, Nb, Ta, Cr, Mo, W, Mn, Zr, Hf, Zn and Ag;
  • wt% is the mass percentage of the element in the neodymium iron boron magnet material
  • Co in the neodymium iron boron magnet material ⁇ 0.5wt% and not 0wt%;
  • the neodymium iron boron magnet material comprises Nd 2 Fe l4 B crystal grains and its shell layer, two grain boundaries adjacent to the Nd 2 Fe l4 B crystal grains and a grain boundary triangle region, and the Nd in R1 is distributed in the Nd 2 Fe 14 B crystal grains, the two-grain grain boundary and the grain boundary triangle area, R2 is mainly distributed in the shell layer, the two-grain grain boundary and the grain boundary triangle area; the grain boundary triangle area
  • the area of the NdFeB magnet material accounts for 1.45-2.9%; the grain boundary continuity of the neodymium iron boron magnet material is more than 97.5%.
  • R2 is mainly distributed in the shell layer, the two-grain boundary and the grain boundary triangle” can be understood as the main distribution of R2 caused by the conventional grain boundary diffusion process in the field (generally refers to 95 % Or more)
  • a small part will also diffuse into the main phase crystal grains, for example, at the outer edges of the main phase crystal grains.
  • wt% is the mass ratio of the additional rare earth elements to the neodymium iron boron raw material composition.
  • the grain boundary triangle area generally refers to a place where three or more grain boundary phases intersect, and there are B-rich phases, rare earth-rich phases, rare earth oxides, rare earth carbides, and cavities distributed.
  • the calculation method of the area ratio of the grain boundary triangle area refers to the ratio of the area of the grain boundary triangle area to the total area (the total area of the crystal grains and the grain boundary).
  • the calculation method of grain boundary continuity refers to the ratio of the length occupied by phases other than voids in the grain boundary (for example, the B-rich phase and the rare earth-rich phase are equal) to the total grain boundary length. Grain boundary continuity of more than 96% can be called continuous channel.
  • the “mass ratio of carbon and oxygen in the two-grain boundary” and “mass ratio of the carbon and oxygen in the triangular area of the grain boundary” can be used to infer that the miscellaneous phase migrates from the triangular area to the two-grain boundary, so that the grain boundary triangle The area is reduced.
  • the common forms of C and O in the magnet are rare earth carbides and rare earth oxides.
  • the mass of C and O in the two-grain boundary is preferably 0.3-0.4%, such as 0.32%, 0.39%, 0.34%, 0.36% or 0.38%.
  • the quality of C and O in the triangular region of the grain boundary preferably accounts for 0.42-0.50%, such as 0.44%, 0.45%, 0.49%, 0.43%, 0.47% or 0.48%.
  • the ratio of the mass of C and O in the triangular region of the grain boundary refers to the ratio of the mass of C and O in the triangular region of the grain boundary to the total mass of all elements in the grain boundary.
  • the mass ratio of C and O in the two-grain boundary refers to the ratio of the mass of C and O in the two-grain boundary to the total mass of all elements in the grain boundary.
  • the C and O elements in rare earth oxides and rare earth carbides are introduced in conventional ways in the art, generally impurity introduction or atmosphere introduction. Specifically, for example, during jet milling and pressing, lubricants are introduced. During sintering, these additives will be removed by heating, but a small amount of C and O elements will inevitably remain; for another example, a small amount of O element will inevitably be introduced due to the atmosphere in the preparation process.
  • the content of C and O are only below 1000 ppm and 1200 ppm, respectively, which belong to the category of conventional acceptable impurities in the field, so they are not included in the product element statistical table.
  • the chemical composition is R 24.09-29.88 M 0.24 ⁇ 0.48 Cu 1.7 ⁇ 2.84 (Fe+Co) 67.35 ⁇ 73.24 phases, where R includes Nd and Tb, and M includes Ti, Ni, V, Nb, Ta, Cr, Mo, W, Mn, Zr, Hf, One or more of Zn and Ag.
  • the structure of the new phase is, for example, R 26.91 (Fe+Co) 69.93 Cu 2.68 M 0.48 , R 24.60 (Fe+Co) 72.73 Cu 2.34 M 0.33 , R 25.35 (Fe+Co) 72.54 Cu 1.70 M 0.41 , R 29.49 (Fe+Co) 67.35 Cu 2.81 M 0.35 , R 24.37 (Fe+Co) 73.24 Cu 2.08 M 0.31 , R 29.88 (Fe+Co) 67.43 Cu 2.31 M 0.38 , R 24.09 (Fe+ Co) 73.18 Cu 2.49 M 0.24 , R 26.11 (Fe+Co) 70.73 Cu 2.84 M 0.32 .
  • R 24.09 ⁇ 29.88 M 0.24 ⁇ 0.48 Cu 1.7 ⁇ 2.84 (Fe + Co) 67.35 ⁇ 73.24 in the two-phase grain boundary in the area ratio is preferably accounts for 1 to 3.2%, e.g. 3.12%, 0.53%, 1.03%, 1.22%, 1.14%, 2.09%, 1.66% and 2.35%.
  • the area ratio of the new phase in the two-grain boundary refers to the ratio of the area of the new phase in the two-grain boundary to the total area of the two-grain boundary.
  • the area of the grain boundary triangle area is preferably 1.49-2.4% or 2.15-2.9%, such as 1.84%, 2.38%, 2.16%, 2.47%, 1.91%, 1.49%, 1.98% or 2.86% .
  • the grain boundary continuity is preferably 98% or more, such as 99.21%, 98.34%, 99.24%, 98.02%, 97.94% or 98.13%.
  • the content of R preferably ranges from 29.5 to 31.5 wt% or 29.8 to 32.8 wt%, for example, 31.2 wt%, 32.2 wt% or 30.9 wt%, and wt% means that the element accounts for the neodymium iron boron magnet The mass percentage of the material.
  • the R1 may also include one or more of Pr, La and Ce; preferably, it includes Pr.
  • the addition form of Pr can be conventional in the art, for example, in the form of PrNd, or in the form of a mixture of pure Pr and Nd, or in the form of a mixture of PrNd, pure Pr and Nd Add to.
  • the content of the Pr is preferably 0.1-2 wt%, and wt% is the mass percentage of the element in the neodymium iron boron magnet material.
  • the content of R2 is preferably in the range of 0.2 to 0.8 wt% or 0.5 to 1 wt%, such as 0.6 wt%, 0.9 wt% or 0.94 wt%, and wt% means that the element accounts for the neodymium iron boron magnet material The percentage of mass.
  • the content of Tb preferably ranges from 0.5 to 1% by weight, such as 0.8% by weight, 0.6% by weight, 0.75% by weight, 0.9% by weight, or 0.7% by weight.
  • the mass percentage of the magnet material preferably ranges from 0.5 to 1% by weight, such as 0.8% by weight, 0.6% by weight, 0.75% by weight, 0.9% by weight, or 0.7% by weight.
  • the R2 may also include one or more of Pr, Dy, Ho and Gd. These rare earth elements can form a shell layer for diffusing rare earth elements through the principle of grain boundary diffusion.
  • the content range of the Pr is preferably 0.2 wt% or less, and not 0 wt%, such as 0.2 wt% or 0.1 wt%, and wt% means that the element accounts for the neodymium iron boron The mass percentage of the magnet material.
  • the content of Dy is preferably less than 0.3% by weight and not 0% by weight, such as 0.1% by weight, 0.05% by weight, or 0.12% by weight.
  • the mass percentage of the neodymium iron boron magnet material is preferably less than 0.3% by weight and not 0% by weight, such as 0.1% by weight, 0.05% by weight, or 0.12% by weight.
  • the content range of the Ho is preferably 0.15wt% or less and not 0wt%, such as 0.1wt% or 0.02wt%, and the wt% means that the element accounts for the neodymium iron boron The mass percentage of the magnet material.
  • the content range of the Gd is preferably 0.15 wt% or less and not 0 wt%, for example, 0.1 wt% or 0.06 wt%, and wt% means that the element accounts for the neodymium iron boron The mass percentage of the magnet material.
  • the content of B is preferably 0.9 to 0.99 wt% or 0.98 to 1.05 wt%, such as 1 wt%, 1.02 wt%, or 1.03 wt%, and wt% means that the element accounts for the neodymium iron boron magnet material The percentage of mass.
  • the content of Cu is preferably 0.07-0.15wt% or less than 0.08wt%, and not 0wt%, such as 0.12wt%, 0.13wt%, 0.03wt%, 0.05wt%, 0.09wt %, 0.1wt% or 0.07wt%, and wt% is the mass percentage of the element in the neodymium iron boron magnet material.
  • the Cu may be added during smelting and/or grain boundary diffusion.
  • the Cu When the Cu is added when it diffuses at the grain boundary, the Cu is added in the form of a PrCu alloy, and the content of Cu is preferably 0.03 to 0.15 wt%, and wt% is the mass percentage of the element in the raw material composition; Wherein, the percentage of Cu in the PrCu is 0.1-17 wt%.
  • the content of M is preferably 0.1-0.15wt% or 0.1-0.32wt%, such as 0.25wt%, 0.32wt%, 0.22wt%, 0.32wt% or 0.2wt%, and wt% is the element It accounts for the mass percentage of the neodymium iron boron magnet material.
  • the M may also include one or more of Bi, Sn, Zn, Ga, In, Au and Pb.
  • the M includes one or more of Ga, Ti and Nb.
  • the content of Ga may range from 0.02 to 0.3 wt%, preferably 0.02 to 0.1 wt% or 0.08 to 0.2 wt%, for example, 0.07 wt%, where wt% is the element accounted for The mass percentage of the neodymium iron boron magnet material.
  • the content of Ti may range from 0 to 0.35 wt%, preferably 0.05 to 0.3 wt% or 0.1 to 0.15 wt%, such as 0.12 wt%, 0.05 wt% or 0.2 wt%, wt% is the mass percentage of the element in the neodymium iron boron magnet material.
  • the content of Nb is preferably in the range of 0.05 to 0.1 wt%, and wt% is the mass percentage of the element in the neodymium iron boron magnet material.
  • the neodymium iron boron material also contains Al; the content of Al is preferably 0.03wt% or less, and not 0wt%, for example, 0.01wt%, and the weight% is the element The mass percentage of the neodymium iron boron magnet material.
  • Al+Ga+Cu may be 0.15wt% or less and not 0wt%, such as 0.12wt%; preferably, Al+Ga+Cu is 0.11 wt% is less than 0 wt%, such as 0.07 wt%, and wt% is the mass percentage of the element in the neodymium iron boron magnet material.
  • the M element includes Ga
  • Ga is 0.2wt% or more and not 0.35wt%
  • Ti+Nb in the composition of the M element is 0.07wt% or less and not 0wt%, for example, 0.05wt%
  • Wt% is the mass percentage of the element in the neodymium iron boron magnet material. Among them, if Ti+Nb is excessive, the remanence may be reduced.
  • the Co content range is preferably 0.4 wt% or less, and is not 0, such as 0.1 wt%, 0.2 wt%, 0.3 wt% or 0.15 wt%, and wt% is the element accounted for The mass percentage of the neodymium iron boron magnet material.
  • the neodymium iron boron material includes the following components in terms of weight percentage: in R1: Nd 27.5wt%; in R2: Tb 0.5wt%; B0.9wt%, Cu 0.15wt% , Ti 0.35wt%, Co 0.1wt%, the balance is Fe and inevitable impurities, and wt% is the mass percentage of the element in the neodymium iron boron magnet material;
  • the area ratio of the triangular area of the grain boundary is 1.84%; the continuity of the grain boundary is 97.51%, and the new phase in the two-grain grain boundary is R 26.91 (Fe+Co) 69.93 Cu 2.68 M 0.48 .
  • the neodymium iron boron material comprises the following components in terms of weight percentage: in R1: Nd 32wt%; in R2: Tb 0.8wt%; B 1wt%, Cu 0.12wt%, Ti 0.15wt%, Nb 0.1wt%, Co 0.2wt%, the balance is Fe and unavoidable impurities, and wt% is the mass percentage of the element in the neodymium iron boron magnet material;
  • the area ratio of the triangular area of the grain boundary is 2.38%; the continuity of the grain boundary is 99.21%, and the new phase in the two-grain boundary is R 24.60 (Fe+Co) 72.73 Cu 2.34 M 0.33 .
  • the neodymium iron boron material includes the following components in terms of weight percentage: in R1: Nd 30.4wt%, Pr 0.2wt%; in R2: Dy 0.1wt%, Tb 0.5wt% ; B 0.98wt%, Cu 0.07wt%, Ti 0.12wt%, Nb 0.1wt%, Ga 0.1wt%, Co 0.3wt%, the balance is Fe and unavoidable impurities, and wt% is the element in the neodymium iron The mass percentage of boron magnet material;
  • the area ratio of the triangular area of the grain boundary is 2.16%; the continuity of the grain boundary is 98.34%, and the new phase in the two-grain boundary is R 25.35 (Fe+Co) 72.54 Cu 1.70 M 0.41 .
  • the neodymium iron boron material comprises the following components in terms of weight percentage: in R1: Nd 30.8wt%, Pr 0.5wt%; in R2: Dy 0.1wt%, Tb 0.6wt% , Pr 0.2wt%; B1.02wt%, Cu 0.13wt%, Ti 0.15wt%, Ga 0.07wt%, Co 0.15wt%, the balance is Fe and unavoidable impurities, wt% is the element accounted for in the neodymium iron The mass percentage of boron magnet material;
  • the area ratio of the triangular area of the grain boundary is 2.47%; the continuity of the grain boundary is 99.24%, and the new phase in the two-grain grain boundary is R 29.49 (Fe+Co) 67.35 Cu 2.81 M 0.35 .
  • the neodymium iron boron material includes the following components in terms of weight percentage: in R1: Nd 29.9wt%; in R2: Dy 0.05wt%, Tb 0.75wt%, Ho 0.1wt% , Gd 0.1wt%; B 1.1wt%, Cu 0.03wt%, Ti 0.05wt%, Ga 0.1wt%, Co 0.15wt%, the balance is Fe and unavoidable impurities, and wt% is the element accounted for in the neodymium iron The mass percentage of boron magnet material;
  • the area of the triangular area of the grain boundary accounts for 1.91%; the continuity of the grain boundary is 98.02%, and the new phase in the two-grain grain boundary is R 24.37 (Fe+Co) 73.24 Cu 2.08 M 0.31 .
  • the neodymium iron boron material includes the following components in terms of weight percentage: in R1: Nd 28.5wt%; in R2: Dy 0.12wt%, Tb 0.7wt%, Pr 0.1wt% , Ho 0.02wt%, Gd 0.06wt%; B 1.03wt%, Cu 0.05wt%, Ti 0.3wt%, Ga 0.02wt%, Co 0.2wt%, the balance is Fe and unavoidable impurities, wt% is element Occupies the mass percentage of the neodymium iron boron magnet material;
  • the area ratio of the triangular area of the grain boundary is 1.49%; the continuity of the grain boundary is 97.94%, and the new phase in the two-grain boundary is R 29.88 (Fe+Co) 67.43 Cu 2.31 M 0.38 .
  • the neodymium iron boron material comprises the following components in terms of weight percentage: in R1: Nd 29wt%; in R2: Tb 0.8wt%; B 0.99wt%, Cu 0.09wt%, Ti 0.2wt%, Al 0.03wt%, Co 0.4wt%, the balance is Fe and inevitable impurities, and the weight% is the mass percentage of the element in the neodymium iron boron magnet material;
  • the area ratio of the triangular area of the grain boundary is 1.98%; the continuity of the grain boundary is 97.88%, and the new phase in the two-grain grain boundary is R 24.09 (Fe+Co) 73.18 Cu 2.49 M 0.24 .
  • the neodymium iron boron material includes the following components in terms of weight percentage: in R1: Nd 30.5wt%; in R2: Dy 0.1wt%, Tb 0.9wt%; B 1wt%, Cu 0.1wt%, Nb 0.05wt%, Ga 0.3wt%, Al 0.01wt%, Co 0.1wt%, the balance is Fe and unavoidable impurities, wt% is the mass percentage of the element in the neodymium iron boron magnet material ;
  • the area ratio of the triangular area of the grain boundary is 2.86%; the continuity of the grain boundary is 98.13%, and the new phase in the two-grain grain boundary is R 26.11 (Fe+Co) 70.73 Cu 2.84 M 0.32 .
  • the present invention also provides a preparation method of neodymium iron boron magnet material, which adopts the raw material composition as described above, the preparation method is a diffusion method, the R1 element is added in the smelting step, and the R2 element It is added in the grain boundary diffusion step.
  • the preparation method preferably includes the following steps: the elements other than R2 in the raw material composition of the neodymium iron boron magnet material are smelted, powdered, molded, and sintered to obtain a sintered body, and then the The mixture of the sintered body and the R2 may be subjected to grain boundary diffusion treatment.
  • the smelting operation and conditions can be conventional smelting processes in the field.
  • the elements other than R2 in the neodymium iron boron magnet material are smelted and casted by ingot casting process and quick-setting sheet process to obtain alloy flakes.
  • the temperature of the smelting may be 1300 to 1700°C, preferably 1450 to 1550°C, such as 1500°C.
  • the vacuum degree of the melting furnace may be 5 ⁇ 10 -2 Pa.
  • the melting equipment is generally a high-frequency vacuum melting furnace, for example, melting in a high-frequency vacuum induction melting furnace.
  • the operation and conditions of the pulverization can be conventional pulverization processes in the field, and generally include two processes of hydrogen crushing pulverization and jet milling pulverization.
  • the hydrogen crushing and pulverizing generally includes hydrogen absorption, dehydrogenation and cooling treatment.
  • the temperature of the hydrogen absorption is generally 20 to 200°C, such as 25°C.
  • the temperature of the dehydrogenation is generally 400-650°C, and may be 500-550°C, such as 550°C.
  • the pressure of the hydrogen absorption is generally 50 to 600 kPa, such as 90 kPa.
  • the air-jet milling powder is generally carried out under the conditions of 0.1-2 MPa, preferably 0.5-0.7 MPa (for example, 0.6 MPa).
  • the gas stream in the gas stream milling powder can be, for example, nitrogen gas.
  • the time for the air jet milling can be 2 to 4 hours, for example, 3 hours.
  • the molding operation and conditions can be conventional molding processes in the field.
  • the magnetic field forming method for example, the magnetic field forming method.
  • the magnetic field strength of the magnetic field forming method is generally above 1.5T.
  • the sintering operation and conditions can be conventional sintering processes in the field.
  • the sintering can be carried out under the condition that the degree of vacuum is lower than 0.5Pa.
  • the sintering temperature may be 1000 to 1200°C, for example, 1030 to 1090°C, and for example, 1040°C.
  • the sintering time may be 0.5-10, such as 2-5, and further for example 2h.
  • the grain boundary diffusion treatment can be processed according to a conventional process in the art, such as R2 coating operation.
  • the R2 is generally coated in the form of fluoride or low melting point alloy, such as Tb alloy or fluoride.
  • the R2 further includes Dy, preferably, Dy is coated in the form of an alloy or fluoride of Dy.
  • the R2 also contains Pr, preferably, Pr is added in the form of a PrCu alloy.
  • the Cu may be added in a smelting and/or grain boundary diffusion.
  • the content of Cu is preferably 0.03 to 0.15 wt%, and wt% is the mass percentage of the element in the raw material composition; wherein the Cu accounts for the percentage of the PrCu It is 0.1-17wt%.
  • the temperature of the grain boundary diffusion may be 800-1000°C, for example 850°C.
  • the time for the grain boundary diffusion may be 5-20h, for example 5-15h, and for example 18h.
  • a low-temperature tempering treatment is also performed according to the conventional practice in the art.
  • the temperature of the low-temperature tempering treatment is generally 460-560°C, for example 550°C.
  • the time for the low-temperature tempering treatment may be 1 to 3 hours.
  • the invention also provides a neodymium iron boron magnet material prepared by the above-mentioned preparation method.
  • the invention also provides an application of the neodymium iron boron magnet material described above in the preparation of magnetic steel.
  • the magnetic steel is preferably 54SH and/or 52UH high-performance magnetic steel.
  • the reagents and raw materials used in the present invention are all commercially available.
  • the magnet material of the present invention has excellent magnet performance, wherein Br ⁇ 14.3kGs, Hcj ⁇ 24.5kOe; 20-120°CBr temperature coefficient ⁇ -0.104%/°C; grain boundary continuity is above 97.5%, triangle area area Less than 2.9%;
  • the magnet material of the present invention can be used in the manufacture of 54SH and/or 52UH high-performance magnetic steel. Since only a low content of Co is required, the production cost is reduced.
  • FIG. 1 is an EPMA photomicrograph of the neodymium iron boron magnet material prepared in Example 1.
  • FIG. 1 is an EPMA photomicrograph of the neodymium iron boron magnet material prepared in Example 1.
  • Table 1 The formula and content of the raw material composition of the neodymium iron boron magnet material (wt%)
  • Airflow milling process Under nitrogen atmosphere, the powder after hydrogen pulverization is pulverized by airflow milling for 3 hours under the condition of 0.6 MPa in the pulverizing chamber to obtain fine powder.
  • each molded body is moved to a sintering furnace for sintering, sintered under a vacuum of less than 0.5 Pa, and sintered at 1040°C for 2 hours to obtain a sintered body.
  • R2 for example, one or more of Tb alloy or fluoride, Dy alloy or fluoride and PrCu alloy
  • R2 for example, one or more of Tb alloy or fluoride, Dy alloy or fluoride and PrCu alloy
  • Each component of the neodymium iron boron magnet material is measured using a high-frequency inductively coupled plasma emission spectrometer (ICP-OES). Table 2 below shows the component test results.
  • the temperature coefficient of remanence of the NdFeB magnet material of the present invention is equivalent to or even better than that of the comparative example; the coercivity is significantly higher than that of the comparative example (embodiments 1 to 8); the reason is: according to the "grain boundary" in the examples The difference of the “mass proportion of C and O in the triangle area” minus the “mass proportion of C and O in the two-grain boundary (%)” is smaller than the comparison ratio. It can be obtained that the miscellaneous phase migrates from the grain boundary triangle to the The conclusion of the two-grain boundary, which explains the improvement of the continuity of the grain boundary and the reason for the improvement of the magnetic properties from the mechanism. It shows that under the same low content of Co, if the formulation of this application is not used for synergistic cooperation, the effect is poor (Comparative Examples 1 to 5).
  • FIG. 1 it is a scanning photo of the microstructure of the NdFeB magnet prepared in Example 1.
  • the structure of the black area is the shedding of the neodymium-rich phase caused by grinding and polishing when the sample is prepared for scanning electron microscope observation. Makes black holes appear in the picture.
  • point 3 is the main phase of Nd 2 Fe 14 B (dark gray area)
  • point 2 is the grain boundary triangle area (silver-white area)
  • point 1 is the new phase R 24.09 ⁇ 29.88 M 0.24 contained in the two grain boundaries. ⁇ 0.48 Cu 1.7 ⁇ 2.84 (Fe+Co) 67.35 ⁇ 73.24 .
  • the results show that the area of the triangular area of the grain boundary is smaller than that of the conventional magnet.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Hard Magnetic Materials (AREA)
  • Powder Metallurgy (AREA)

Abstract

L'invention concerne un matériau d'aimant néodyme-fer-bore, une composition de matière première, son procédé de préparation et son utilisation, la composition de matière première contenant les composants suivants : R : 28 à 33 % en poids ; R représentant des éléments des terres rares et comprenant un métal des terres rares utilisé pour la fusion R1 et un métal des terres rares utilisé pour la diffusion de limite de grain R2, la teneur en R2 étant de 0,2 à 1 % en poids, R1 comprenant Nd et ne contenant pas RH, et R2 comprenant Tb ; B : 0,9 à 1,1 % en poids ; Cu : 0,15 % en poids ou moins et plus de 0 % en poids ; M : 0,4 % en poids ou moins et plus de 0 % en poids, M comprenant un ou plusieurs éléments parmi Ti, Ni, V, Nb, Ta, Cr, Mo, W, Mn, Zr, Hf, Zn, et Ag ; Fe : 60 à 70,5 % en poids ; Co : ＜ 0,5 % en poids et plus de 0 % en poids ; RH étant un élément des terres rares lourd. Le matériau magnétique présente les avantages d'une rémanence élevée, d'une coercivité élevée et d'excellentes performances à haute température.
PCT/CN2021/077174 2020-02-26 2021-02-22 Matériau d'aimant neodyme-fer-bore, composition de matière première, son procédé de préparation et son utilisation WO2021169889A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202010121476.6 2020-02-26
CN202010121476.6A CN111261355B (zh) 2020-02-26 2020-02-26 钕铁硼磁体材料、原料组合物、制备方法、应用

Publications (1)

Publication Number Publication Date
WO2021169889A1 true WO2021169889A1 (fr) 2021-09-02

Family

ID=70947429

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2021/077174 WO2021169889A1 (fr) 2020-02-26 2021-02-22 Matériau d'aimant neodyme-fer-bore, composition de matière première, son procédé de préparation et son utilisation

Country Status (2)

Country Link
CN (1) CN111261355B (fr)
WO (1) WO2021169889A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111261355B (zh) * 2020-02-26 2021-09-28 厦门钨业股份有限公司 钕铁硼磁体材料、原料组合物、制备方法、应用
CN112992460B (zh) * 2021-03-17 2023-04-14 福建省长汀金龙稀土有限公司 一种r-t-b磁体及其制备方法
CN114373593B (zh) * 2022-03-18 2022-07-05 宁波科宁达工业有限公司 一种r-t-b磁体及其制备方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07122413A (ja) * 1993-10-28 1995-05-12 Hitachi Metals Ltd 希土類永久磁石およびその製造方法
CN102103916A (zh) * 2009-12-17 2011-06-22 北京有色金属研究总院 一种钕铁硼磁体的制备方法
CN104078176A (zh) * 2013-03-28 2014-10-01 Tdk株式会社 稀土类磁体
CN110537235A (zh) * 2018-03-23 2019-12-03 日立金属株式会社 R-t-b系烧结磁体的制造方法
CN110828089A (zh) * 2019-11-21 2020-02-21 厦门钨业股份有限公司 钕铁硼磁体材料、原料组合物及制备方法和应用
CN111261355A (zh) * 2020-02-26 2020-06-09 厦门钨业股份有限公司 钕铁硼磁体材料、原料组合物、制备方法、应用

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MY149353A (en) * 2007-03-16 2013-08-30 Shinetsu Chemical Co Rare earth permanent magnet and its preparations
JP4900121B2 (ja) * 2007-03-29 2012-03-21 日立化成工業株式会社 フッ化物コート膜形成処理液およびフッ化物コート膜形成方法
JP6037128B2 (ja) * 2013-03-13 2016-11-30 戸田工業株式会社 Ｒ−ｔ−ｂ系希土類磁石粉末、ｒ−ｔ−ｂ系希土類磁石粉末の製造方法、及びボンド磁石
CN103258633B (zh) * 2013-05-30 2015-10-28 烟台正海磁性材料股份有限公司 一种R-Fe-B系烧结磁体的制备方法
US11037724B2 (en) * 2017-01-31 2021-06-15 Hitachi Metals, Ltd. Method for producing R-T-B sintered magnet
CN108899149A (zh) * 2018-08-29 2018-11-27 南京理工大学 一种重稀土Dy高效扩散制备高矫顽力钕铁硼磁体的方法
CN110571007B (zh) * 2019-09-03 2021-06-11 厦门钨业股份有限公司 一种稀土永磁材料、原料组合物、制备方法、应用、电机

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07122413A (ja) * 1993-10-28 1995-05-12 Hitachi Metals Ltd 希土類永久磁石およびその製造方法
CN102103916A (zh) * 2009-12-17 2011-06-22 北京有色金属研究总院 一种钕铁硼磁体的制备方法
CN104078176A (zh) * 2013-03-28 2014-10-01 Tdk株式会社 稀土类磁体
CN110537235A (zh) * 2018-03-23 2019-12-03 日立金属株式会社 R-t-b系烧结磁体的制造方法
CN110828089A (zh) * 2019-11-21 2020-02-21 厦门钨业股份有限公司 钕铁硼磁体材料、原料组合物及制备方法和应用
CN111261355A (zh) * 2020-02-26 2020-06-09 厦门钨业股份有限公司 钕铁硼磁体材料、原料组合物、制备方法、应用

Also Published As

Publication number Publication date
CN111261355B (zh) 2021-09-28
CN111261355A (zh) 2020-06-09

Similar Documents

Publication Publication Date Title
WO2021169891A1 (fr) Matériau d'aimant néodyme-fer-bore, composition de matière première, son procédé de préparation et son utilisation
WO2021169889A1 (fr) Matériau d'aimant neodyme-fer-bore, composition de matière première, son procédé de préparation et son utilisation
WO2021169888A1 (fr) Matériau d'aimant neodyme-fer-bore, composition de matière première, son procédé de préparation et son utilisation
WO2021169886A1 (fr) Matériau d'aimant neodyme-fer-bore, composition de matière première, son procédé de préparation et son utilisation
WO2021169890A1 (fr) Matériau d'aimant neodyme-fer-bore, composition de matière première, son procédé de préparation et son utilisation
WO2021169887A1 (fr) Matériau d'aimant neodyme-fer-bore, composition de matière première, son procédé de préparation et son utilisation
TWI755152B (zh) 釹鐵硼磁體材料、原料組合物及製備方法和應用
WO2021218701A1 (fr) Matériau d'aimant permanent d'alliage de neodyme, de fer et de bore, composition de matière première, procédé de préparation et utilisation
CN111312461B (zh) 一种钕铁硼磁体材料、原料组合物及制备方法和应用
WO2021218698A1 (fr) Matériau d'aimant ndfeb, et composition de matières premières de celui-ci, procédé de préparation et utilisation associés
WO2021244315A1 (fr) Matériau d'aimant néodyme-fer-bore, composition de matière première, son procédé de préparation et son utilisation
WO2021169892A1 (fr) Matériau d'aimant au néodyme-fer-bore, composition de matière première, son procédé de préparation et son utilisation
CN111613403B (zh) 钕铁硼磁体材料、原料组合物及其制备方法和应用
CN111599565A (zh) 钕铁硼磁体材料、原料组合物及其制备方法和应用
WO2021218699A1 (fr) Matériau d'aimant néodyme-fer-bore, composition de matière première, son procédé de préparation et application
WO2021218700A1 (fr) Matériau d'aimant néodyme-fer-bore, composition de matière première, son procédé de préparation et son utilisation
TW202305841A (zh) 一種釹鐵硼磁體材料及其製備方法和應用
WO2021244314A1 (fr) Matériau d'aimant en néodyme-fer-bore, composition de matière première, son procédé de préparation et son utilisation
WO2021169901A1 (fr) Matériau à aimant permanent à système r-t-b, son procédé de préparation et son utilisation

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21760648

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 21760648

Country of ref document: EP

Kind code of ref document: A1